android自定义相机拉伸(stretch)surfaceview

Question

我遇到了相机 View 的问题，即相机的 View 被拉长了，不像默认相机应用程序或任何其他相机应用程序提供的那样提供正常 View 。我一直无法获得相机用来拉伸(stretch)大于屏幕尺寸的表面 View 。

 enter code here
  private class SurfaceCallback implements SurfaceHolder.Callback {
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            camera = Camera.open(); 
            camera.setPreviewDisplay(holder); 
            camera.setDisplayOrientation(getPreviewDegree(MainActivity.this));
            camera.startPreview(); // 
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
     @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        setCameraParameters();
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }
}
  private int getPreviewDegree(Activity activity) {
    int rotation = activity.getWindowManager().getDefaultDisplay()
            .getRotation();
    int degree = 0;

    switch (rotation) {
        case Surface.ROTATION_0:
            degree = 90;
            break;
        case Surface.ROTATION_90:
            degree = 0;
            break;
        case Surface.ROTATION_180:
            degree = 270;
            break;
        case Surface.ROTATION_270:
            degree = 180;
            break;
    }
    return degree;
}

private void setCameraParameters() {

    Camera.Parameters parameters = camera.getParameters();

    List<Camera.Size> sizeList = parameters.getSupportedPreviewSizes();
    if (sizeList.size() > 0) {
        Camera.Size cameraSize = sizeList.get(0);

        parameters.setPreviewSize(cameraSize.width, cameraSize.height);
    }


    sizeList = parameters.getSupportedPictureSizes();
    if (sizeList.size() > 0) {
        Camera.Size cameraSize = sizeList.get(0);
        for (Camera.Size size : sizeList) {

            if (size.width * size.height < 10 * 100) {
                cameraSize = size;
                break;
            }
        }
        parameters.setPictureSize(cameraSize.width, cameraSize.height);
    }

    parameters.setPictureFormat(ImageFormat.JPEG);
    parameters.setJpegQuality(100);
    parameters.setJpegThumbnailQuality(100);

    parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
    camera.setParameters(parameters);

    startOrientationChangeListener();
}

private void startOrientationChangeListener() {

    OrientationEventListener mOrEventListener = new    OrientationEventListener(MainActivity.this) {
        @Override
        public void onOrientationChanged(int rotation) {

            if (((rotation >= 0) && (rotation <= 45)) || (rotation > 315)) {
                rotation = 0;
            } else if ((rotation > 45) && (rotation <= 135)) {
                rotation = 90;
            } else if ((rotation > 135) && (rotation <= 225)) {
                rotation = 180;
            } else if ((rotation > 225) && (rotation <= 315)) {
                rotation = 270;
            } else {
                rotation = 0;
            }
            if (rotation == mOrientation)
                return;
            mOrientation = rotation;
            updateCameraOrientation();
        }
    };
    mOrEventListener.enable();
}

 private void updateCameraOrientation() {
    if (camera != null) {
        Camera.Parameters parameters = camera.getParameters();

        int rotation = 90 + mOrientation == 360 ? 0 : 90 + mOrientation;

        if (mIsFrontCamera) {
            if (rotation == 90) rotation = 270;
            else if (rotation == 270) rotation = 90;
        }
        parameters.setRotation(rotation);

        camera.setDisplayOrientation(90);
        camera.setParameters(parameters);
    }
}

Answer 1

您可以从这个项目开始。 https://github.com/pikanji/CameraPreviewSample